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publish.go
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publish.go
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package publish
import (
"errors"
"sync"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/libbeat/publisher"
)
type Transactions interface {
PublishTransaction(common.MapStr) bool
}
type Flows interface {
PublishFlows([]common.MapStr) bool
}
type PacketbeatPublisher struct {
beatPublisher *publisher.BeatPublisher
client publisher.Client
ignoreOutgoing bool
wg sync.WaitGroup
done chan struct{}
trans chan common.MapStr
flows chan []common.MapStr
}
type ChanTransactions struct {
Channel chan common.MapStr
}
func (t *ChanTransactions) PublishTransaction(event common.MapStr) bool {
t.Channel <- event
return true
}
var debugf = logp.MakeDebug("publish")
func NewPublisher(
pub publisher.Publisher,
hwm, bulkHWM int,
ignoreOutgoing bool,
) (*PacketbeatPublisher, error) {
return &PacketbeatPublisher{
beatPublisher: pub.(*publisher.BeatPublisher),
ignoreOutgoing: ignoreOutgoing,
client: pub.Connect(),
done: make(chan struct{}),
trans: make(chan common.MapStr, hwm),
flows: make(chan []common.MapStr, bulkHWM),
}, nil
}
func (p *PacketbeatPublisher) PublishTransaction(event common.MapStr) bool {
select {
case p.trans <- event:
return true
default:
// drop event if queue is full
return false
}
}
func (p *PacketbeatPublisher) PublishFlows(event []common.MapStr) bool {
select {
case p.flows <- event:
return true
case <-p.done:
// drop event, if worker has been stopped
return false
}
}
func (p *PacketbeatPublisher) Start() {
p.wg.Add(1)
go func() {
defer p.wg.Done()
for {
select {
case <-p.done:
return
case event := <-p.trans:
p.onTransaction(event)
}
}
}()
p.wg.Add(1)
go func() {
defer p.wg.Done()
for {
select {
case <-p.done:
return
case events := <-p.flows:
p.onFlow(events)
}
}
}()
}
func (p *PacketbeatPublisher) Stop() {
p.client.Close()
close(p.done)
p.wg.Wait()
}
func (p *PacketbeatPublisher) onTransaction(event common.MapStr) {
if err := validateEvent(event); err != nil {
logp.Warn("Dropping invalid event: %v", err)
return
}
if !p.normalizeTransAddr(event) {
return
}
p.client.PublishEvent(event)
}
func (p *PacketbeatPublisher) onFlow(events []common.MapStr) {
pub := events[:0]
for _, event := range events {
if err := validateEvent(event); err != nil {
logp.Warn("Dropping invalid event: %v", err)
continue
}
pub = append(pub, event)
}
p.client.PublishEvents(pub)
}
func (p *PacketbeatPublisher) IsPublisherIP(ip string) bool {
for _, myip := range p.beatPublisher.IPAddrs {
if myip == ip {
return true
}
}
return false
}
func (p *PacketbeatPublisher) GetServerName(ip string) string {
// in case the IP is localhost, return current shipper name
islocal, err := common.IsLoopback(ip)
if err != nil {
logp.Err("Parsing IP %s fails with: %s", ip, err)
return ""
}
if islocal {
return p.beatPublisher.GetName()
}
return ""
}
// filterEvent validates an event for common required fields with types.
// If event is to be filtered out the reason is returned as error.
func validateEvent(event common.MapStr) error {
ts, ok := event["@timestamp"]
if !ok {
return errors.New("missing '@timestamp' field from event")
}
_, ok = ts.(common.Time)
if !ok {
return errors.New("invalid '@timestamp' field from event")
}
t, ok := event["type"]
if !ok {
return errors.New("missing 'type' field from event")
}
_, ok = t.(string)
if !ok {
return errors.New("invalid 'type' field from event")
}
return nil
}
func (p *PacketbeatPublisher) normalizeTransAddr(event common.MapStr) bool {
debugf("normalize address for: %v", event)
var srcServer, dstServer string
src, ok := event["src"].(*common.Endpoint)
debugf("has src: %v", ok)
if ok {
// check if it's outgoing transaction (as client)
isOutgoing := p.IsPublisherIP(src.IP)
if isOutgoing {
if p.ignoreOutgoing {
// duplicated transaction -> ignore it
debugf("Ignore duplicated transaction on: %s -> %s", srcServer, dstServer)
return false
}
//outgoing transaction
event["direction"] = "out"
}
srcServer = p.GetServerName(src.IP)
event["client_ip"] = src.IP
event["client_port"] = src.Port
event["client_proc"] = src.Proc
event["client_server"] = srcServer
delete(event, "src")
}
dst, ok := event["dst"].(*common.Endpoint)
debugf("has dst: %v", ok)
if ok {
dstServer = p.GetServerName(dst.IP)
event["ip"] = dst.IP
event["port"] = dst.Port
event["proc"] = dst.Proc
event["server"] = dstServer
delete(event, "dst")
//check if it's incoming transaction (as server)
if p.IsPublisherIP(dst.IP) {
// incoming transaction
event["direction"] = "in"
}
}
return true
}